Graded Quiz Unit 3
A case study that deals with the effect of prior reputation on the evaluation of an instructor is
presented in Question 11.1 in the book (Section 11.5). Students were exposed to either one of two
co
...
Graded Quiz Unit 3
A case study that deals with the effect of prior reputation on the evaluation of an instructor is
presented in Question 11.1 in the book (Section 11.5). Students were exposed to either one of two
conditions, C and P, and were asked to rate a lecture given by the instructor. It was found that the
average rating among the 25 students that were exposed to condition C was 2.613 and the average
rating among the 24 students that were exposed to condition P was 2.236. The sample standard
deviations were 0.533 and 0.543, respectively.
Quesion 1 Correct Mark 1.00 out of 1.00 Flag question
You want to construct a confidence interval for the expected rating of students that were exposed to
condition P. The confidence level of the interval should be 80%. The quantile of the t-distribution
that should be used for the construction is: (Assume a Normal distribution for the rating)
Select one:
a. qt(0.85,23)
b. qt(0.925,24)
c. qt(0.90,23)
Home My courses MATH 1281 - AY2021-T4 22 April - 28 April Graded Quiz Unit 3
Graded Quiz Unit 3: Attempt review
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d. qt(0.925,23)
The correct answer is: qt(0.90,23)
Quesion 2 Correct Mark 1.00 out of 1.00 Flag question
The confidence interval with confidence level of 80% for the expected rating of students that were
exposed to condition P is: (Assume a Normal distribution for the rating. Choose the interval closest
to the answer)
Select one:
a. [2.09, 2.38]
b. [2.47, 2.76]
c. [2.14, 2.33]
d. [2.52, 2.71]
The correct answer is: [2.09, 2.38]
Quesion 3 Incorrect Mark 0.00 out of 1.00 Flag question
The confidence interval with confidence level of 75% for the variance of the rating of students that
were exposed to condition P is: (Assume a Normal distribution for the rating. Choose the interval
closest to the answer)
Select one:
a. [0.404, 0.805]
b. [0.250, 0.374]
c. [0.219, 0.437]
d. [0.460, 0.689]
The correct answer is: [0.219, 0.437]
Information Flag question
Graded Quiz Unit 3: Attempt review
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Confidence intervals are computed for the expectation and the variance of a measurement on the
basis of 15 observations. The confidence interval are constructed under the assumption that the
measurement has a Normal distribution. In reality, the distribution of the observations is the
Exponential(1/3) distribution. Recall that the expectation of the measurement is 3 and the variance is
9. Use simulations to answer the following questions:
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